Sectional type pile foundation

Abstract

The utility model relates to a sectional type pile foundation which comprises a pile foundation body and a bearing platform, the bearing platform is arranged at the top end of the pile foundation body, the pile foundation body comprises a stabilizing part and a tensile part, the stabilizing part and the tensile part are integrally formed, the stabilizing part is located in a bearing soil layer, and the tensile part is located in a pull-down soil layer. A plurality of tensile grooves are formed in the tensile part, the surfaces of the tensile grooves are wrapped with blocking pieces used for separating a downward-pulling soil layer, a holding and pressing section is arranged between every two adjacent tensile grooves, and the diameter of each holding and pressing section is consistent with that of the stabilizing part. The utility model has the effect of improving the construction efficiency of the pile foundation.

Description

Technical Field

[0001] The utility model relates to the technical field of pile foundations, in particular to a segmented pile foundation. Background Art

[0002] A deep foundation consisting of a pile and a pile cap connected to the top of the pile, or a single pile foundation connected by a column and a pile foundation, is referred to as a pile foundation. If the pile body is completely buried in the soil and the bottom of the cap is in contact with the soil, it is called a low cap pile foundation; if the upper part of the pile body is exposed to the ground and the bottom of the cap is above the ground, it is called a high cap pile foundation. Building pile foundations are usually low cap pile foundations. Pile foundations are widely used in high-rise buildings.

[0003] The surface of the soil layer is affected by the heap load, causing the soil layer at a certain depth (called the pull-down soil layer) to settle. During the settlement process, the soil layer will produce a downward pulling force on the pile foundation. This pulling force is negative friction. If the pile foundation descends due to negative friction, it will affect the bearing capacity of the pile foundation. Therefore, the impact of negative friction on the pile foundation must be reduced as much as possible in the project. Below the soil layer that settles at a certain depth is the bearing soil layer, and part of the pile foundation must enter the bearing soil layer.

[0004] The Chinese patent with the announcement number CN219710288U discloses a negative friction resistance reduction device for pile foundation, which includes a casing, a mounting frame and a ball. The casing includes an inner casing and an outer casing which are sequentially sleeved on the pile foundation from the inside to the outside. The mounting frame is fixedly connected to the outer peripheral surface of the inner casing, and the inner casing is provided with a connecting hole for connecting the inner and outer sides of the inner casing. The ball is rotatably connected to the mounting frame and passes through the connecting hole and is used to abut against the pile foundation. The rotation axis of the ball is perpendicular to the axis of the casing. When the soil layer sinks, negative friction resistance is generated on the outer peripheral surface of the outer casing, and the outer casing blocks the outer soil layer from affecting the pile foundation. The rotatably connected balls provide support force to the pile foundation in the circumferential direction, so that the pile foundation is only subjected to the rolling friction force of the balls. The rolling friction force is much smaller than the friction force generated by other circumferential support structures, which can better prevent the pile foundation from tilting.

[0005] With regard to the above-mentioned related technologies, in the prior art, the staff utilizes the cooperation of the outer casing and the ball bearings to allow the pile foundation to smoothly enter between the fill area and the bedrock. However, such a setting requires the excavation of a foundation pit in advance, and then the outer casing and the elastic cushion are installed on the bedrock, and then the soil layer is backfilled. Although the outer casing can separate the soil layer from the pile foundation so that the pile foundation is not affected, the installation of the outer casing requires a larger project (including excavation of the foundation pit and backfilling), which will extend the construction period of the pile foundation and reduce the construction efficiency of the pile foundation. Utility Model Content

[0006] In order to improve the construction efficiency of the pile foundation, the present application provides a segmented pile foundation.

[0007] This application provides a segmented pile foundation using the following technical solutions:

[0008] A segmented pile foundation includes a pile foundation and a bearing platform. The bearing platform is arranged at the top of the pile foundation. The pile foundation includes a stabilizing part and a tensile part. The stabilizing part and the tensile part are integrally formed, and the stabilizing part is located in the bearing soil layer, and the tensile part is located in the downward-dragging soil layer. A number of tensile grooves are formed on the tensile part, and a barrier for separating the downward-dragging soil layer is wrapped on the surface of the tensile grooves. A holding and pressing section is arranged between two adjacent tensile grooves, and the diameter of the holding and pressing section is the same as that of the stabilizing part.

[0009] By adopting the above technical solution, the staff uses the stabilizing part to penetrate into the bearing soil layer to provide stable support for the pile foundation. Then, by setting the holding and pressing section, it is convenient for the static pile press to grab and press the holding and pressing section to sink the pile. Then, the tensile grooves are covered with the barrier to reduce the contact area between the pile foundation and the downward-dragging soil layer. When the downward-dragging soil layer settles, only the holding and pressing section is applied with a force. In this way, the contact area between the pile foundation and the downward-dragging soil layer is reduced as much as possible, and the influence of the negative skin friction on the pile foundation is reduced. During construction, compared with the prior art, the staff only needs to use the static pile press to sink the pile foundation, saving the steps of excavating the foundation pit and filling the soil, shortening the construction period of the pile foundation, and improving the construction efficiency of the pile foundation.

[0010] Optionally, the barrier is a foam board, and the diameter of the barrier is smaller than that of the holding and pressing section.

[0011] By adopting the above technical solution, the closed-cell structure of the foam board can block the penetration of moisture, reducing the possibility of moisture penetrating into the pile foundation as much as possible, ensuring the structural strength of the pile foundation, and extending the service life of the pile foundation.

[0012] Optionally, a number of anti-slip convex strips are integrally formed on the inner wall of the barrier ring, and the anti-slip convex strips are uniformly distributed along the axial direction of the barrier. Anti-slip grooves are formed at the positions corresponding to the anti-slip convex strips on the inner wall of the tensile groove, and the anti-slip convex strips are embedded in the anti-slip grooves.

[0013] By adopting the above technical solution, during the settlement process of the downward-dragging soil layer, the downward-dragging soil layer will form a downward pulling force on the foam board. In this way, the foam board has the possibility of deformation and movement. The staff uses the anti-slip convex strips to increase the friction between the foam board and the pile foundation, reducing the possibility of displacement and deformation of the foam board.

[0014] Optionally, the surface of the barrier is wrapped with asphalt felt, and the diameter of the outer wall of the asphalt felt is smaller than that of the holding and pressing section.

[0015] By adopting the above technical solution, the pulling soil layer exerts a tensile force on the foam board, and there is a possibility of damage to the surface of the foam board. The damaged foam board will reduce its protective performance. The staff wraps the foam board with asphalt felt to further protect the foam board and reduce the possibility of damage to the foam board. Coupled with the waterproof performance of the asphalt felt itself, the possibility of moisture penetrating into the pile foundation is further reduced.

[0016] Optionally, both ends of the asphalt felt are connected by Velcro, and a number of nail guns are inserted between both ends of the asphalt felt and the barrier member.

[0017] By adopting the above technical solution, when installing the asphalt felt, the staff first connects both ends of the asphalt felt by using Velcro, and then uses a compressed air-powered nail gun to drive nail guns into both ends of the asphalt felt, so that the nail guns pass through both ends of the asphalt felt and the foam board, making the installation of the asphalt felt more firm while limiting the relative angle between the asphalt felt and the barrier member, and further ensuring the firmness of the installation of the foam board and the asphalt felt.

[0018] Optionally, the surface of the asphalt felt is coated with graphite lubricant.

[0019] By adopting the above technical solution, the surface of the asphalt felt is relatively rough, and there will also be a certain frictional force between the pulling soil layer and the asphalt felt to pull the asphalt felt downward, which easily causes displacement and deformation of the foam board and the asphalt felt. The staff uses graphite lubricant to reduce the roughness of the surface of the asphalt felt and reduce the influence of the pulling soil layer on the asphalt felt.

[0020] Optionally, both ends of the tensile groove are integrally formed with limiting rings, the inner wall of the limiting ring fits the asphalt felt, and installation notches are formed on the limiting rings.

[0021] By adopting the above technical solution, the limiting rings are used to facilitate the installation of the barrier member and the asphalt felt. The staff uses the limiting rings to preliminarily limit the barrier member and the asphalt felt when wrapping the tensile groove, so that the barrier member and the asphalt felt maintain the state of wrapping the tensile groove, which provides convenience for the installation of the asphalt felt.

[0022] Optionally, the pile foundation is precast from waterproof concrete, and a steel reinforcement cage is arranged inside the pile foundation.

[0023] By adopting the above technical solution, the waterproof concrete is used to further improve the waterproof performance of the pile foundation, reduce the possibility of the steel reinforcement cage rusting and reducing its structural strength, ensure the structural strength of the pile foundation, and improve the service life of the pile foundation.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. The staff inserts the stabilizing part into the bearing stratum to provide stable support for the pile foundation. Then, by setting the holding and pressing section, it is convenient for the static pile press to grab and press the pile into the ground. Next, the tensile groove is covered with a barrier to reduce the contact area between the pile foundation and the downward-pulling soil layer. When the downward-pulling soil layer subsides, it only exerts a force on the holding and pressing section. In this way, the contact area between the pile foundation and the downward-pulling soil layer is minimized as much as possible, and the influence of negative skin friction on the pile foundation is reduced. During construction, compared with the prior art, the staff only needs to use the static pile press to drive the pile foundation into the ground, saving the steps of excavating the foundation pit and filling the soil, shortening the construction period of the pile foundation, and improving the construction efficiency of the pile foundation. Description of the Drawings

[0026] Figure 1 It is a schematic diagram of the overall structure of the segmented pile foundation in the embodiment of the present application.

[0027] Figure 2 It is a cross-sectional view for showing the structure of the pile foundation in the embodiment of the present application.

[0028] Figure 3 It is an exploded view for showing the structure of the pile foundation in the embodiment of the present application.

[0029] Description of the reference numerals: 01, downward-pulling soil layer; 02, bearing stratum; 1, pile foundation; 11, bearing platform; 12, stabilizing part; 13, tensile part; 14, tensile groove; 15, holding and pressing section; 2, barrier; 21, anti-slip convex strip; 3, asphalt felt; 31, nail; 4, limiting ring; 41, installation notch. Detailed Embodiment

[0030] The following further Figures 1 - 3 describes the present application in detail.

[0031] The embodiment of the present application discloses a segmented pile foundation. Referring to Figure 1 and Figure 2 , the segmented pile foundation includes a pile foundation 1 and a bearing platform 11, and the bearing platform 11 is cast on the top of the pile foundation 1. The pile foundation 1 is prefabricated from waterproof concrete material, and a steel reinforcement cage is arranged inside the pile foundation 1. The waterproof concrete material is used to further improve the moisture permeability resistance of the pile foundation 1 and reduce the possibility of the steel reinforcement cage rusting. The pile foundation 1 includes a stabilizing part 12 and a tensile part 13, and the stabilizing part 12 and the tensile part 13 are integrally formed. The stabilizing part 12 is located in the bearing stratum 02, and the tensile part 13 is located above the stabilizing part 12 and within the downward-pulling soil layer 01.

[0032] Referring to Figure 1 and Figure 2, a number of tensile grooves 14 are formed on the tensile part 13. In this embodiment, taking two as an example, the two tensile grooves 14 are arranged at intervals, and a clamping section 15 is formed between the two tensile grooves 14. The diameter of the clamping section 15 is the same as that of the stabilizing part 12. The clamping section 15 is used to provide a grasping position for the static pile driver, making it easier for the entire pile foundation 1 to be driven into the ground.

[0033] Referring to Figure 1 and Figure 3 , a barrier member 2 is arranged on the surface of the tensile groove 14. The barrier member 2 is a foam board, and the barrier member 2 wraps the surface of the tensile groove 14. The barrier member 2 is used to improve the waterproof performance of the pile foundation 1 and is inexpensive. A number of anti-slip ridges 21 are integrally formed on the inner wall of the barrier member 2. The cross-section of the anti-slip ridges 21 is semi-elliptical, and the number of anti-slip ridges 21 is evenly distributed along the axial direction of the barrier member 2. Anti-slip grooves are formed at the positions corresponding to the anti-slip ridges 21 on the surface of the tensile groove 14, and the anti-slip ridges 21 are embedded in the anti-slip grooves. The cooperation of the anti-slip ridges 21 and the anti-slip grooves is used to assist in limiting the barrier member 2, reducing the possibility of displacement of the barrier member 2.

[0034] Referring to Figure 2 and Figure 3 , in order to reduce the possibility of damage to the barrier member 2, the barrier member 2 is wrapped with asphalt felt 3. The diameter of the asphalt felt 3 after wrapping the barrier member 2 is smaller than the diameter of the clamping section 15. The two ends of the asphalt felt 3 are connected by Velcro. The Velcro is used for the preliminary installation of the asphalt felt 3. A number of nail guns 31 are embedded at the positions corresponding to the Velcro on the asphalt felt 3. The nail guns 31 pass through the asphalt felt 3 and the barrier member 2. The nail guns 31 are used to further limit the asphalt felt 3, reducing the possibility of the asphalt felt 3 coming loose. Graphite lubricant is applied on the surface of the asphalt felt 3. The graphite lubricant is used to reduce the surface roughness of the asphalt felt 3, reducing the influence of the pulled soil layer 01 on the asphalt felt 3.

[0035] Referring to Figure 1 and Figure 3 , in order to facilitate the installation of the barrier member 2 and the asphalt felt 3, limiting rings 4 are integrally formed at both ends of the tensile groove 14. The outer diameter of the limiting ring 4 is smaller than the diameter of the clamping section 15, and the inner wall of the limiting ring 4 fits the asphalt felt 3. An installation notch 41 is formed on the limiting ring 4. The installation notch 41 is used to facilitate the entry of the barrier member 2 and the asphalt felt 3 into the tensile groove 14.

[0036] The implementation principle of a segmented pile foundation 1 in an embodiment of the present application is as follows: Before pile driving, the staff sequentially introduce the barrier member 2 and the asphalt felt 3 into the tensile groove 14 from the installation notch 41, then preliminarily connect the two ends of the asphalt felt 3 using the Velcro, then use a compressed air-powered nail gun to pass the nail guns 31 through the asphalt felt 3 and the barrier member 2 at the Velcro, and finally apply graphite lubricant on the surface of the asphalt felt 3, completing the preparatory work before pile driving of the pile foundation 1.

[0037] The staff uses the stabilizing part 12 to penetrate into the bearing stratum 02 to provide stable support for the pile foundation 1. Subsequently, by setting the hugging and pressing section 15, it is convenient for the static pile press to grab and press the hugging and pressing section 15 for pile sinking. Then, the blocking part 2 is used to cover the tensile resistance groove 14 to reduce the contact area between the pile foundation 1 and the downward-pulling soil layer 01. When the downward-pulling soil layer 01 subsides, it only exerts a force on the hugging and pressing section 15. In this way, the contact area between the pile foundation 1 and the downward-pulling soil layer 01 is minimized as much as possible, and the influence of negative skin friction on the pile foundation 1 is minimized as much as possible. During construction, compared with the prior art, the staff only needs to use the static pile press to sink the pile foundation 1, saving the steps of excavating the foundation pit and filling the soil, shortening the construction period of the pile foundation 1, and improving the construction efficiency of the pile foundation 1.

[0038] The above are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A segmented pile foundation, comprising a pile foundation (1) and a cap (11), wherein the cap (11) is arranged at the top of the pile foundation (1), characterized in that: The pile foundation (1) comprises a stabilizing portion (12) and a tensile portion (13), wherein the stabilizing portion (12) and the tensile portion (13) are integrally formed, and the stabilizing portion (12) is located in the bearing soil layer (02), and the tensile portion (13) is located in the lower pulling soil layer (01). The tensile portion (13) is provided with a plurality of tensile grooves (14), and the surface of the tensile grooves (14) is wrapped with a barrier (2) for separating the lower pulling soil layer (01). A holding section (15) is provided between two adjacent tensile grooves (14), and the diameter of the holding section (15) is consistent with the diameter of the stabilizing portion (12).

2. The segmented pile foundation according to claim 1, characterized in that: The barrier (2) is a foam board, and the diameter of the barrier (2) is smaller than the diameter of the holding and pressing section (15).

3. The segmented pile foundation according to claim 2, characterized in that: A plurality of anti-skid convex strips (21) are integrally formed on the inner ring wall of the barrier (2), and the plurality of anti-skid convex strips (21) are evenly distributed along the axial direction of the barrier (2). An anti-skid groove is formed on the inner wall of the tensile groove (14) at a position corresponding to the anti-skid convex strips (21), and the anti-skid convex strips (21) are embedded in the anti-skid groove.

4. The segmented pile foundation according to claim 1, characterized in that: The surface of the barrier (2) is wrapped with asphalt felt (3), and the diameter of the outer ring wall of the asphalt felt (3) is smaller than the diameter of the holding section (15).

5. The segmented pile foundation according to claim 4, characterized in that: The two ends of the asphalt felt (3) are connected by Velcro, and a plurality of gun nails (31) are inserted between the two ends of the asphalt felt (3) and the barrier element (2).

6. The segmented pile foundation according to claim 4, characterized in that: The surface of the asphalt felt (3) is coated with graphite lubricant.

7. The segmented pile foundation according to claim 4, characterized in that: Both ends of the tensile groove (14) are integrally formed with a limiting ring (4), the inner ring wall of the limiting ring (4) fits the asphalt felt (3), and the limiting ring (4) is provided with a mounting notch (41).

8. The segmented pile foundation according to claim 1, characterized in that: The pile foundation (1) is prefabricated from waterproof concrete, and a steel cage is built into the pile foundation (1).

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